Android :: JSON Deserialization Using GSON
Nov 24, 2010
I have the following json response from a url:
CODE:........
And here's how I'm doing the parse:
CODE:.......................
When I run the code, I get this error: ERROR/AndroidRuntime(823): java.lang.RuntimeException: No-args constructor for class com.project.driver.Driver$Post does not exist. Register an InstanceCreator with Gson for this type to fix this problem.
I'm having trouble with defining a suitable Driver.java for the parse. When I omit the 'last5comments' field, everything works fine, it's just the 'last5comments' bit I'm having trouble with...
Here is Driver.java:
CODE:......................
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Jul 29, 2010
I am trying to parse a json object using gson in Android application ,the test passed quite gracefully in emulator ,while i used the actual device ,the problems started.
I am getting the exception as follows.
CODE:...................
I am using gson 1.4 version.The code i use is:
CODE:..............
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Jun 24, 2010
I'm building simple app, simply to learn the android ropes, that will display a list of the most recent photos uploaded to flickr. The app is constructed but it's crapping out when it tries to deserialize the json that I get back from flickr. Here is my error:
CODE:....................
From, the error I'm assuming it has something GSON doesn't like about the json that is being returned but I don't know enough about how java converts objects and other types of variables during the whole operation.
I'm not sure if you will need this but here is some of the code from the project:
CODE:..........
Here is FlickrPhotos:
CODE:........
Here is FlickrPhoto:
CODE:...................
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Sep 24, 2010
What is "deserializing Json" means, I had seen this term on the Web. I don't know the meaning od this particular term So, it would be great if anybody can explain me about What it means actually?
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Dec 2, 2009
(Code is for Android Actually, I need code to be portable between Android and Java SE.)
I want to have a "settings" class with various game settings, like
public int map_size;
public String server_name;
etc.
The data needs to be accessed fairly frequently (so members, not a key-value map), and from time to time de/serialized in some standard way (mainly to send it through network).
I want to be able to
Serialize and deserialize the object into XML or JSON, without having to explicitly write the code for every member (but still having some degree of control over the format).
Define some (constant) meta-data about every member (default value, GUI name, XML identifier, ...), in a way that allows for easy modification in the source code (I want to be able to add a new meta-property, define a default value for it, and not have to specify it everywhere else).
1 is achievable by using reflection. I thought Java annotations for class members would be perfect for 2:
CODE:.............
But it looks like (user-defined) annotations don't work in Android yet - code using them crashes the compiler...
What would be the easiest way to store the meta-data about the settings (or another way to approach all this)?
Store information about settings in some external XML file? Store it in a Java data structure, with content defined in the code? Defining the data in this way somehow seems very unwieldy, especially compared to keyword arguments of annotations?
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Mar 4, 2010
I'm playing arround with google gson for communication with my web back end at the moment.
This and this older posts indicate that there are some problems with gson on android.
I did some easy tests on the device already but maybe I just missed the bug.
Edit I'm now parsing a lot more data. Generic lists etc. still not encountered the bug.
Has anybody used gson on Android already? How does it work? Has somebody encountered bugs or something that will stop me from using it once it gets more complicated?
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Sep 2, 2010
I am developing an Android application and I access a RESTfull web service that returns a JSON. This JSON I want to put it in POJOs but I think I am missing something as it doesn't work.
The JSON retuned is as follow:
CODE:.....
This is returned in response variable
CODE:.............
And now I try the following:
CODE:................
The error I get is:
CODE:.................
Here are the POJO objects
CODE:.......
To access the web service I use the class from: http://lukencode.com/2010/04/27/calling-web-services-in-android-using-httpclient/
Can't figure out how to continue. I found some subjects here but still didn't found a way around.
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Jul 6, 2010
I'm trying to deserialize json data to an ArrayList of Restaurant object as follows (inpsired by what I found in https://sites.google.com/site/gson/gson-user-guide#TOC-Collections-Examples):
CODE:...............
But this gives the error shown at the end of the post.
It seems that there is some null pointer in listType... Here's a watch of listType:
CODE:...............
What's wrong with my code? How can I do that?
CODE:....................
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Jun 20, 2010
I'm relatively new to Java, eclipse and android so this could be a completely silly question, but I'm going to ask it none the less.
I've got a project I'm learning with to test connecting to the flickr api and simply displaying recent images. I'm at the point now where I want to parse the JSON received from flickr. I've downloaded gson 1.4 and added the zip to the java build path through "add external jars." It's successfully loaded and I can see google-gson under referenced libraries in the package explorer. My problem is, when I try to use it, I simply get an error.
Gson gson = new Gson();
It highlights Gson and says that "Gson cannot be resolved to a type." What am I missing here? It worked once and has since stopped. I've tried removing the jars, cleaning the project and re-adding the jars but it still doesn't work.
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May 4, 2010
I'm trying to create an rss feed that my droid app reads but i have some holes that i can figure how to fix the json link page is http://www.mandarich.com/mandarichServer/mlb/indexbaseball.php when reading the json i can see where the icon is missing on some and cant figure out why. mainly only for citys like ney york and chicago(cities with two names)
and the code i have for the php is as follows ...
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Apr 16, 2010
I do not know the reason why am i getting same values of different JSON date values. Here is my code for parsing date values in JSON date format:
package com.jsondate.parsing;
import java.text.SimpleDateFormat; import java.util.Date;
import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.widget.TextView;
public class JSONDateParsing extends Activity {/** Called when the activity is first created. */String myString;
@Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
TextView tv = new TextView(this);
//Date d = (new Date(1266029455L));
//Date d = (new Date(1266312467L));
Date d = (new Date(1266036226L));
//String s = d.getDate() + "-" + d.getMonth() + "-" + d.getYear() + d.getHours() +
d.getMinutes() + d.getSeconds();
// SimpleDateFormat sdf=new SimpleDateFormat("yyyy MMM dd @ hh:mm aa"); //Toast.makeText(this, d.toString(), Toast.LENGTH_SHORT);
Log.e("Value:", d.toString());
myString = d.toString();
String []words = myString.split(" ");
for(int i = 0;i < words.length; i++)
Log.e("Value:", words[i]);
myString = words[2] + "-" + words[1] + "-" + words[5] + " " + words[3];
tv.setText(myString);
setContentView(tv);
} }
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Oct 8, 2009
I'm trying to parse JSON in android but am having trouble with accessing sub children of an object. I am trying to extract augment from the following. Code...
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Apr 7, 2010
I have the following JSON text that i need to parse to get page Name, pagePic, post_id, etc. What is the required code? page Info: { page Name: abc pagePic: http://profile.ak.fbcdn.net/object2/367/... }
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Jun 12, 2010
String s = [{"id": 1, "fields": {"Name": "hello1", "Age": "10" }}, {"id": 2, "model": "fields": {"Name": "hello2", "Age": "12"}}] I get error when I do this Code...
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Jun 12, 2010
Is there any code snippet for getting and posting JSON object to a http server in Android? I want to call the API in my website and get the JSON response to be displayed in the Android apps.
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Aug 26, 2010
Is there a good example showing how to query a server and downloading the response (JSON or XML)?
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Oct 7, 2010
Here I am posting my Json Response below:
CODE:.......
Now I want to have the following data Parsed "Phone", "Distance", "City", "Title", "State" and only "AverageRating" from the Tag "Rating".
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May 12, 2010
In the application I am developing, I would like to send messages in the form of JSON objects to a Django Server and parse the JSON response from the server and populate a custom listview.
From the little JSON knowledge I have, I thought this format for the response from server
CODE:...
How much knowledge of JSON should I have to accomplish this purpose? Also it would be great if someone could provide me links of some tutorials for sending and parsing JSON Objects.
Is there any advantage using GSON Parser rather than 'get' command for parsing JSON responses?
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Oct 29, 2010
How to parse following json return from facebook.i tried my self by searching on net But i failed.
CODE:.............
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Oct 9, 2010
I have this JSON to parse.
CODE:....
I would like to know how can I get the first value artist1 and then the second one artist2
This is what I am doing :
CODE:....
I got java.lang.classCastException for this JSONObject tmp = rowIt.next();
So there are my two questions: Do I need to use iterators in this case ? How do one should use them ?
Should the JSON looks like this ?
CODE:....................................
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Oct 13, 2010
I am trying to send a list of objects from an android mobile phone app to a j2ee webserver.
I create json objects and then put the objects into an jsonarray(in an order) and then send it. I am able to receive the jsonarray on the server, obtain the objects individually too, but the order of how I inserted the objects into the jsonarray is different compared to the order present in the received array. The order of elements plays a crucial role in my data processing. Could somebody please tell me a workaround for this.
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Aug 30, 2010
I want to pull out the user block. The JSON result will always change, sometimes 4 users will be returned, sometimes 10 etc...
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Oct 28, 2010
i m facing prob in parsing this obj
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Aug 26, 2010
I would like to be able to pull out different fields like Name and Symbol etc. How can I create my JSONObject in Android to do this?
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Sep 27, 2010
i searched the net to find something about how to pass arguments to JSON c# .net web service, but i didn't find anything useful for me. I have to pass arguments like GUID or at least Username and Password. Is params.put("var", ""); the right thing? How do i pass multiple parameters like this, let's say username and password?
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Jul 30, 2010
I've just recently started out with Android development, and have progressed to the point where I have written a very basic Hello World Jersey RESTful web service, and successfully called it from within my Android App.What I want to do now though, is send a new user record (just name and password for now) to a web service in JSON format.I can create my JSON in the Android app just fine, but I don't know how to get it into the HTTP Request in such a way that the corresponding web service that @Consumes JSON can get at it.
1) Create Android App User object
2) Turn that into JSON
3) Put it on the HTTP request
4) Call the web service
5) Web service retrieve JSON from request
6) Parse the JSON into server side User object and deal with as I see fit(Don't worry people, I'll be fine with this bit,
7) Profit! ;)
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Aug 4, 2010
I am building an android app that needs to download and synchronise with an online database, I am sending my query from the app to a php page which returns the relevant rows from a database in JSON format.
Tell me the best way to iterate through a JSON array?
I receive an array of objects:
[{json object},{json object},{json object}]
What is the simplest piece of code I could use to access the JSONObjects in the array?
Now that I think of it the method I used to iterate the loop was:
CODE:.............
So I guess I had was somehow able to turn the returned Json into and iterable array. Any Ideas how I could achieve this?
I apologise for my vaguness but I had this working from an example I found on the web and have since been unable to find it.
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Jul 1, 2009
I have a browser application that uses Json to retrieve some latitude/ longitude data from my netbook and I would like to port it to Android. Can you point me to some code samples that retrieve data from Android and return it to the browser. The browser fills in some form data fields and returns the form to the server for processing The application can be seen at http:gpsmancer.com/ourtown-B
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Aug 7, 2010
What is push notification and xml/json parsing?
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Aug 27, 2010
I am writing a simple Android app and have a database that will send back information into the app. I am new to Android and am looking for a simple example that demonstrates how the Android App can process a JSON response received from a HTTP request. I need to see what classes are used for Android apps to process a HTTP response. A reference to a good tutorial, or if you're keen, write a very basic method to do the job.
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